HDO700 P FIBRE OPTIC TRANSMITTER

Transcription

1 Timo Rantanen (5) HDO700 P FIBRE OPTIC TRANSMITTER HDO700 P is a high performance, extremely linear externally modulated 1550 nm transmitter for HDO fibre optic CATV link. This transmitter type has been optimised especially for an analog channel line up to 550 MHz and a digital loading can be transmitted above 550 MHz. Features Management features 1U 19 rack housing Adjustable SBS suppression enables the highest performance at all transmission spans Two optical outputs Built in preamplifier APC circuitry for constant loading Front panel display Front panel test point Front panel user interface with LCD display, keyboard and status LEDs Remote control of all adjustments by SNMP Fully compatible with Commander and EMS software SNMP versions Monitoring and control of: Optical output power (ON / OFF) OMI control mode (AGC or manual) SBS threshold setting Monitoring of: Drive level (OMI) Status of CSO compensation circuit Status of SBS circuit Optical output power (dbm or mw) Laser temperature Laser bias current TEC current Internal temperature Internal supply voltages +24, +12, +5 and -5 VDC

2 Timo Rantanen (5) Technical specifications Parameter Specification Note Optical parameters Wavelength 1550 ± 10 nm 1) Optical line width 500 khz 2) Output power 2 x 7.5 dbm 3) Relative intensity noise -160 dbc/hz 4) SBS suppression threshold +13, +16 or +18 dbm 5) 1 ch 3% 6) Number of optical outputs 2 RF parameters Frequency range MHz Input level dbµv 7) Flatness ±0.75 db 8) RF impedance 75 Ω RF input return loss 18 db 9) Spurious beats -60 db 10) Test point 75 dbµv 11) 65 km fibre link, fibre amplifier, NTSC 77 chs 0 dbm to receiver 52 db 12) CTB 65 db 13) CSO 65 db 14) General Supply voltages VAC / Hz Power consumption 45 W 15) Connectors, RF F female Management interface RJ-45 Optical SC/APC Dimensions 485 x 350 x 44.5 (19 1U) 16) Weight 8 kg Enclosure classification IP21 Operating temperature range C Storage temperature range C Operating relative humidity 0 85%

3 Timo Rantanen (5) Notes 1) This is a variation range between various transmitters. 2) Typical line width of the source laser. The maximum value is 1 MHz. 3) Typical value. The minimum value is +7.0 dbm. 4) Maximum value. 5) A user can change the SBS suppression threshold value. 6) Typical value for NTSC 77 chs loading. 7) NTSC 77 chs. The nominal value is 80 dbµv/ ch. 8) Maximum value. 9) Typical value. The minimum value is 16 db. 10) Maximum value. 11) Typical value for NTSC 77 chs. 12) Typical value. The minimum value is 51.5 db. The C/N influence of the optical input power of a receiver can be seen in the following example. The fibre link consists of - HDO700 P transmitter - Fibre km + optical attenuation, total db optical - Fibre optic CATV receiver C/N vs. link attenuation C/N Input power of receiver (dbm)

4 Timo Rantanen (5) Two optical fibre amplifiers can be needed if there are mounted optical splitters generating additional optical losses in a fibre link. The following figure shows the C/N influence of the optical input power of the 2 nd fibre amplifier. The fibre link consists of - HDO700 P transmitter - Fibre 0 20 km + optical attenuation, total 7 14 db optical - Fibre 40 km + optical attenuation, total 16 db optical - Fibre optic CATV receiver C/N vs. input power of 2nd fibre amplifier C/N Input power of 2nd fibre amplifier (dbm) 13) Minimum value. 14) Minimum value for the output 1. The minimum value for the output 2 is 63 db. 15) Typical value. The maximum value is 100 W. 16) Width x depth x height.

5 Timo Rantanen (5) Block Diagram TP IN db PREDISTORTION CIRCUIT MODULATOR OUTPUT 2 OUTPUT 1 LASER CONTROL SBS SUPPRESSION CIRCUIT CSO CONTROL CONTROLLER ETHERNET SNMP INTERFACE Ordering information HDO700 P configuration map HDO700P Connector SS FC E2 SC/APC with shutter FC/APC E2000/APC 2-1 ITU grid channel 34 DWDM ITU Ch 34, nm XX 1550 ± 10 nm 3-1 SBS suppression AD Adjustable dbm 13 Fixed 13 dbm 16 Fixed 16 dbm 18 Fixed 18 dbm 4-1 Control Interface RS RS485 SN SNMP 5-1 Power feeding SA 230 VAC DA 230 VAC Dual SD -48 VDC 6-1 Select AA Select this and confirm NE5000L-SS-XX-AD-SN-SA AB Select this and confirm NE5000L-SS-XX-16-SN-SA AC Select this and confirm NE5000L-E2-XX-AD-SN-SA AD Select this and confirm NE5000L-E2-XX-16-SN-SA AE Select this and confirm NE5000L-SS-XX-AD-SN-DA DOC , Rev004